Liner puller



Nov, 22, 1927.

R. F. MAXWELL LINER FULLER Filed April 6. 1926 will 7 RAYMOND Patented Nov. 22, 1927,

UN TED ATE n MAxwELL, or'nonefnnadn, 'clrtirnnmyassienon on oNE-nAL-r T0 CHESTER e. HOSMER; OF--HUNTINGTON:BEACH,. 'CALIFOR;NIAQ I LINER FULLER.

Application filed A rn'e f- This invention relates to devices for removing pump l1ners, bush ngs, valve seats,

bearing. races and similar ring-likeor cylin- .drical i'nembers from the mach nes or devices in wh'ich they are used,".the;same being herein showneand descrlbedjas applied to .a lining for a pump. -VV-hen pumps areused forlinaterials containing inud,sand or other gritty or abrad-ing materials, asin oil wells, the wear uponthewalls about the pistons. is so rapid as'speedily'torender the pumps.

unfit'forservice unless the surfaces of said wallsare frequently-renewed. This renewal is made posslble by the useof liners which fit into fthe cylinders so; tightly as to require considerable effortto remove them, especlal pensive, and in operation is speedy andposi- 'tlve;

In the drawings: 3

Figures 1, 2 "and 8 are, respectively, a side elevation, a longitudinal sectional view and cylinder showing'the liner therein and the manner in whichthe puller'of. Figs. 1 to-3 is employed'for removing the liner..

Referring to the drawings, in the nature of aspider, thesame having a ring-like threaded portion 8 from which project opposite pairs of lugs 9 and 10; Be-

tween the lugs?) there is pivoted the upper end of a grappling dog 11; and a similar but reversely' turned dog 12 is pivoted between the lugs 10. At... the lower .part" of pose hereinafter stated.

Extending through the member 7 i screwor bolt 1 1, the same having athreaded'portioii 15 in engagement with operating thethreadsof said memberand a threaded portion16 at 'or'adjacent' its outer end. 17 is a nut which screwsup'on the threads f 7 is a member" 1926. Serial no. 100,051.: f

the portion 16. of the. bolt,saidnut'having I a bearing uponza bridge member 18. For

purposeshereinafter statedfthis member is preferably. provided with apair of adjusting screws .19 on opposite sides o'f,,the nut.- 7

At its outer end beyond the threaded portion 16 the .bolt is formed into awrench engag- 1 ing' portion 20.

The inner endof the bolt toforma shouldered bearing .21 for a disc 22, and is then upset or riveted ,tof'lmild the disc from coming off the bolt, although the disc is permitted to turn freely on its bear- The confronting ageor, the grip ng dogs 11 and 12 arecurved inwardly towards each other, as indicated at. 23, and theedges are adapted for engagement: with the disc 22 :as the latter is moved with respect thereto,

whereby the dogs may be expanded as des red. v f

To make clear the operation, reference will now bemade to Fig. 4,.wherein there is shown acylinder'24 of-a conventional pump or similar device havingailiner-25. To ap- 11 and 12 must first be collapsedin order that they may be inserted through: the liner.

This isaccomplishedby turning the bolt 14 within the member 7, thereby inioving the disc 22 into the-wide part ofthe space be- ,ply my invention to this' assemblyithe dogs is then turned in the opposite direction to,-

ber 18. -;The partsare now in position for pulling-the liner and this ifs-effected by turning' the -,nut 17; in" that direction which causes the bolt 14 to move outwardly, as will be understood. Of "course, at-thistime the engagement of the dogs with the liner ,will

cause the disc. 22 to j force the dogs 1-1 out 7 hold the spider member 18 from rotating.

WVhile the nut 17 is supposed to turn upon the threads 16, there is a strong resistance to such turning when the pull becomes heavy and a proportional tendency for the bolt 14.

to turn in the spidermember 8, Thislmay actually occur for a short increment of travel of the disc 22 along the converging l-Il edges of the dogs; but as the expanding movement ofthe dogs brings the edges at 12 against the walls of the liner, further expansion of the dogs 11 and further rotation of 1 the bolt 14 is prevented. It is one of the ad vantages of my invention that in its opera- 7 tion, the tenacity of its engagement with the member 18 rest directly against the cylinder;

liner being pulled is directly proportional to the pulling stress exerted and there can be no'slipping of the dogs on the liner.

Generally the liners pull withbomparative ease after they have once been started and broken away from their initial positions and it is practicable to have the bridge of the liner while pulling.

In order to prevent the threads 16 of the bolt from impinging against the bridge member and wearing away, I prefer to depress the member about the bolt hole to form a conical or rounded seat for the nut'17 as indicated at26 in Fig. 2, and to form'the contacting face of the nut to fit this depression. By this simple feature the bolt is centered in the member and the threads are preserved.

It will be noted that the expanding and collapsing movements of the dogs are effected by the same screw 14 which pulls the liner. This is another advantage of my invention. It will be further noted that after the disc 22 engages the dogs in expanding the latter, it turns freely on the end of the bolt and does not turn across the edges of the dogs. This isstill another advantage of my invention as it avoids wearing of the disc and dogs. 7

The term liner is used in the following claims in' a descriptive and not'a limiting sense, it being understood that the invention may be employed for pullin than liners as previously stated.

Having thus described my invention and the manner of its use, what I claim as new is: 1. A liner puller having in combination g devices other ;a gripping element adaptedto grip the end and side walls of a liner or the like, a pulling device adapted to withdraw the grip ping element and liner, and means slidably engaging the gripping element tending to cause a tighter grip on the side walls of the liner as the tension on the pulling device a plurality of grappling dogs adapted to grip the end and side walls of a liner or the like, a pulling bolt operatively connected to the said dogs a bridge through which; the

bolt ext-ends, a nut threaded, on the bolt bearing on the bridge, and means actuated by the bolt for. slidably engaging the dogs to tighten the grip of same on the side walls tive to the gripping dogs and on the rotation of the'bolt due to the rotating action of the nut being threaded on the'bolt. V

3. A liner puller comprising in combinaof the liner on the rotation of the bolt relaa tion a spider, a plurality of grappling dogs 7 pivotally' conneoted thereto and adapted'to grip the end and side walls of a liner or the like, a bolt threaded through the spider, an expanding device forming an operative slid able connection between the bolt and the dogs,

adapted to expand theflatteron rotation of the bolt, a bridge through which the bolt extends, and a nut on the bolt bearing on the bridge, the rotation of the nut in one direct-ion exerting tension to'withdr'a-w the 7 bolt andgrip the side walls of the liner and the rotation ofthe bolt in the direction of rotation of the nut tightening the grip of the dogs on the liner.

4. A liner puller comprising in combina tion a spider, a plurality ofgripping dogs pivotally connected thereto, a boltithreaded through the spider, an expanding device swivelled on the end'of the bolthaving an operative, engagement with the dogs to expand same onv rotation of the bolt in one direction, a bridge through which the bolt 1.

extends, a nut'threaded on the bolt bearing on the bridge. the threads of the bolt allowing therotation of the'nut in one direction to exert atension on the bolt to withdraw the dogs and grip the liner,the rotation of the nut tending to rotate the bolt, whereby the expandingdeviceexpands the dogs 'to more tightly grip the .liner and prevent rotation of said bolt. p" v 5. A liner puller comprising 'in'combination a spider having a plurality of grappling -dogs pivotally'connected thereto, the said dogs having .a curved inner surface, a bolt threaded through the spider hav ng a d sc swivelled on one end, the disc being adapted pivotally mounted thereon, the said dogs having curved inner edgesand outer shoulders, the shoulders being adapted to engage liner, a bolt threaded through the spider,

to' engage the curved surfaces of the dogs, a

a disc swivelled on the end of the bolt, the disc beingadapted to engage the curved'sun faces of the dogs, a bridge through which the bolt extends, a nut threaded on the bolt, the bridge having a slightly conical seat adapted to center the nut, the threads on the. bolt extending through the nut and through the spider being-in the same direction, whereby the tightening of the against the bridge in tensioning the bolt may 1 rotate the bolt, the rotation of the bolt forcing the disc into tighter engagement With the grappling dogs.

In testimony whereof I have signedmy name to this specification.

RAYMOND F. MAXWELL. 

